Hi my name is*****'m a UK Belling Engineer. Firstly take note of this product code -###-##-####-- this will be needed in the future. Lets go through this in stages +
a. From what you have said the lower left hand conventional oven is working fine - Yes?
b. The grill oven if switched on trips the electric - Yes?
C. Main fan oven doesnt work at all and there is no display ?
Do you have a multimeter?
OK buy a cheap multimeter with decent length probles for about £10. Should be able to measure AC volts and have a continuity beeper. Then parts --
Left hand oven - grill element
Main Oven is a little more tricky as it could be just a thermal fuse that has blown or the selector switch, thermostat, minute minder or oven element. Probably best to check things when you get there rather than spending lots on parts you dont really need.
Middle of the range, spare parts easy to get as is the technical information if needed. Could I now ask you to rate the information given to allow me to close the job down on my screen. Once done you can come back to me at anytime for further information on a free of charge basis - just log back onto this question and you will be routed to my desk. Thank you for using JA and have a good day. Ian